#!/usr/bin/env python3
#
# Copyright (C) 2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Drop the enable/disable from the nat "log" node. If log node is specified
# it is "enabled"

from sys import argv,exit
from vyos.configtree import ConfigTree

if len(argv) < 2:
    print("Must specify file name!")
    exit(1)

file_name = argv[1]

with open(file_name, 'r') as f:
    config_file = f.read()

config = ConfigTree(config_file)

if not config.exists(['nat']):
    # Nothing to do
    exit(0)
else:
    for direction in ['source', 'destination']:
        # If a node doesn't exist, we obviously have nothing to do.
        if not config.exists(['nat', direction]):
            continue

        # However, we also need to handle the case when a 'source' or 'destination' sub-node does exist,
        # but there are no rules under it.
        if not config.list_nodes(['nat', direction]):
            continue

        for rule in config.list_nodes(['nat', direction, 'rule']):
            base = ['nat', direction, 'rule', rule]

            # Check if the log node exists and if log is enabled,
            # migrate it to the new valueless 'log' node
            if config.exists(base + ['log']):
                tmp = config.return_value(base + ['log'])
                config.delete(base + ['log'])
                if tmp == 'enable':
                    config.set(base + ['log'])

    try:
        with open(file_name, 'w') as f:
            f.write(config.to_string())
    except OSError as e:
        print("Failed to save the modified config: {}".format(e))
        exit(1)
